Like the deployment checklist T411065, but in reverse.
####Undeployment checklist
**Documentation**
- [] Update extension page to note the extension is archived https://www.mediawiki.org/wiki/Extension:WP25EasterEggs
- [] WMF stewardship: Remove the project from the mediawiki Maintainers page
- [] Ensure the help page is archived https://www.mediawiki.org/wiki/Help:Extension:WP25EasterEggs
- [] Archive the Phabricator component board #mediawiki-extensions-wp25eastereggs & #pes1.3.3_wp25_easter_eggs boards
**Code** (Listed in operational order)
- [] Disable the feature flag in wikimedia-config
- [] Remove the extension from the production branch from mediawiki-config
- [] Remove or archive the project from translatewiki.net?
- [] Archive the project on Gerrit? (not sure if that's a thing)
**Portal**
- [] Remove the birthday mode features from www.wikipedia.org